Adrian Hunter 3876c574e4 perf tools: Fix segfault accessing sample_id xyarray ... commit a668cc07f9 upstream. perf_evsel::sample_id is an xyarray which can cause a segfault when accessed beyond its size. e.g. # perf record -e intel_pt// -C 1 sleep 1 Segmentation fault (core dumped) # That is happening because a dummy event is opened to capture text poke events accross all CPUs, however the mmap logic is allocating according to the number of user_requested_cpus. In general, perf sometimes uses the evsel cpus to open events, and sometimes the evlist user_requested_cpus. However, it is not necessary to determine which case is which because the opened event file descriptors are also in an xyarray, the size of whch can be used to correctly allocate the size of the sample_id xyarray, because there is one ID per file descriptor. Note, in the affected code path, perf_evsel fd array is subsequently used to get the file descriptor for the mmap, so it makes sense for the xyarrays to be the same size there. Fixes: d1a177595b ("libperf: Adopt perf_evlist__mmap()/munmap() from tools/perf") Fixes: 246eba8e90 ("perf tools: Add support for PERF_RECORD_TEXT_POKE") Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: stable@vger.kernel.org # 5.5+ Link: https://lore.kernel.org/r/20220413114232.26914-1-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-04-27 14:38:50 +02:00
..
Documentation	libperf: Add evsel mmap support	2021-04-15 16:38:51 -03:00
include	libperf tests: Fix verbose printing	2021-08-24 15:05:35 -03:00
tests	libperf tests: Fix test_stat_cpu	2021-10-14 15:41:35 -03:00
Build	libperf: Change tests to single static and shared binaries	2021-07-07 11:41:58 -03:00
Makefile	libperf: Change tests to single static and shared binaries	2021-07-07 11:41:58 -03:00
core.c	…
cpumap.c	libperf cpumap: Take into advantage it is sorted to optimize perf_cpu_map__max()	2021-08-31 16:17:02 -03:00
evlist.c	perf tools: Fix segfault accessing sample_id xyarray	2022-04-27 14:38:50 +02:00
evsel.c	libperf evsel: Make use of FD robust.	2021-09-18 17:43:06 -03:00
internal.h	…
lib.c	…
libperf.map	libperf: Adopt evlist__set_leader() from tools/perf as perf_evlist__set_leader()	2021-07-09 14:04:32 -03:00
libperf.pc.template	…
mmap.c	libperf: Add support for user space counter access	2021-04-20 08:10:45 -03:00
threadmap.c	…
xyarray.c	…